Electronic device, wireless communication method and computer-readable medium

ABSTRACT

The present invention relates to an electronic device, a wireless communication method and a computer-readable medium. The electronic apparatus for wireless communication according to one embodiment comprises a processing circuit. The processing circuit is configured to perform control to carry out carrier aggregation communication with a base station by means of at least a first cell and a second cell. The processing circuit is further configured to perform control to send first information for beam failure recovery of the second cell to the base station by means of the first cell.

CROSS-REFERENCE TO RELATED APPLICATIONS

The present application is based on PCT filing PCT/CN2020/070442, filedJan. 6, 2020, which claims the priority to Chinese Patent ApplicationNo. 201910024037.0, titled “ELECTRONIC DEVICE, WIRELESS COMMUNICATIONMETHOD AND COMPUTER-READABLE MEDIUM”, filed on Jan. 10, 2019 with theChinese Patent Office, each of which is incorporated herein by referencein its entirety.

TECHNICAL FIELD

The present disclosure generally relates to the field of wirelesscommunications, and in particular to an electronic device for wirelesscommunication, a wireless communication method, and a computer readablemedium.

BACKGROUND

A beam failure recovery (BFR) process at user equipment (UE) includes:beam failure detection (BFD), new candidate beam identification (NBI),sending a beam failure recovery request (BFRQ), and monitoring aresponse of a base station (gNB) to the beam failure recovery request.

Specifically, as shown in FIG. 10 , in S1002, a beam failure conditionmay be determined in a case that an assumed block error rate (BLER) ofeach of reference signals (RSs) is higher than a threshold. In S1004, itmay be considered that a beam failure occurs in a case that N beamfailure conditions have been determined. In S1006, UE determines acandidate beam, and may identify a physical random access channel(PRACH) for carrying a BFR request based on the newly determined beam.In S1008, the UE monitors a BFR response.

In a carrier aggregation (CA) scenario, a UE may be configured withmultiple cells, including a primary cell (PCell) and secondary cells(SCells). The SCells may include an SCell having an uplink (UL) and anSCell only having a downlink (DL). The UE performs radio resourcecontrol (RRC) communication with a base station (gNB) through the PCell.

SUMMARY

A brief summary of embodiments of the present disclosure is given in thefollowing, so as to provide basic understanding on some aspects of thepresent disclosure. It should be understood that, the summary is not anexhaustive summary of the present disclosure. The summary is neitherintended to determine key or important parts of the present disclosure,nor intended to limit the scope of the present disclosure. An object ofthe summary is to provide some concepts in a simplified form, aspreamble of a detailed description later.

According to an embodiment, an electronic device for wirelesscommunication is provided. The electronic device includes processingcircuitry. The processing circuitry is configured to perform control toperform carrier aggregation communication with a base station through atleast a first cell and a second cell. The processing circuitry isfurther configured to perform control to transmit first information forbeam failure recovery of the second cell to the base station through thefirst cell.

According to another embodiment, a wireless communication methodincludes a step of performing carrier aggregation communication with abase station through at least a first cell and a second cell. The methodfurther includes a step of transmitting first information for beamfailure recovery of the second cell to the base station through thefirst cell.

According to another embodiment, an electronic device for wirelesscommunication is provided. The electronic device includes processingcircuitry. The processing circuitry is configured to perform control toperform carrier aggregation communication with user equipment through atleast a first cell and a second cell. The processing circuitry isfurther configured to perform control to receive first information forbeam failure recovery of the second cell which is transmitted by theuser equipment through the first cell.

According to another embodiment, a wireless communication methodincludes a step of performing carrier aggregation communication withuser equipment through at least a first cell and a second cell. Themethod further includes a step of receiving first information for beamfailure recovery of the second cell which is transmitted by the userequipment through the first cell.

According to another embodiment, a computer readable medium is furtherprovided. The computer readable medium includes executable instructionsthat, when executed by an information processing apparatus, cause theinformation processing apparatus to execute the above methods.

With the embodiments of the present disclosure, BFR can be effectivelyperformed for different cells in a CA scenario.

BRIEF DESCRIPTION OF THE DRAWINGS

The present disclosure may be understood better with reference to thedescription given in conjunction with drawings hereinafter. The same orsimilar reference numerals are used to indicate the same or similarcomponents throughout all the drawings. The drawings together with thefollowing detailed description are included in the specification, form apart of the specification, and are used to further illustrate preferredembodiments of the present disclosure and explain principles andadvantages of the present disclosure by examples. In the drawings:

FIG. 1 is a block diagram showing a configuration example of anelectronic device for wireless communication according to an embodimentof the present disclosure;

FIG. 2 is a block diagram showing a configuration example of anelectronic device for wireless communication according to anotherembodiment of the present disclosure;

FIG. 3 is a flowchart showing a process example of a wirelesscommunication method according to an embodiment of the presentdisclosure;

FIG. 4 is a block diagram showing a configuration example of anelectronic device for wireless communication according to an embodimentof the present disclosure;

FIG. 5 is a block diagram showing a configuration example of anelectronic device for wireless communication according to anotherembodiment of the present disclosure;

FIG. 6 is a flowchart showing a process example of a wirelesscommunication method according to an embodiment of the presentdisclosure;

FIG. 7 is a block diagram showing an exemplary structure of a computerfor implementing the methods and apparatuses according to the presentdisclosure;

FIG. 8 is a block diagram showing an exemplary configuration of a smartphone to which technology according to the present disclosure may beapplied;

FIG. 9 is a block diagram showing an exemplary configuration of a gNB towhich the technology according to the present disclosure may be applied;

FIG. 10 is a flowchart for explaining a general process of BFR;

FIG. 11 is a schematic diagram showing an exemplary scenario of BFR;

FIG. 12 is a schematic diagram showing an exemplary scenario of BFR;

FIG. 13 is a schematic diagram showing an exemplary scenario of BFR;

FIG. 14 is a schematic diagram for explaining an example of groupingcells;

FIG. 15 is a schematic diagram showing an example of multiple cells;

FIG. 16 is a schematic diagram for explaining an example of BFR ofgrouped cells;

FIG. 17 is a schematic diagram for explaining an example of a manner ofindicating a cell;

FIG. 18 is a schematic diagram for explaining an example of a manner ofindicating a cell;

FIG. 19 is a schematic diagram for explaining an example of a manner forindicating a candidate beam;

FIG. 20 is a schematic diagram for explaining an example of BFR ofmultiple cells;

FIG. 21 is a schematic diagram for explaining an example of BFR ofmultiple cells; and

FIG. 22 is a signaling flowchart showing a process example of BFR.

DETAILED DESCRIPTION OF EMBODIMENTS

Embodiments of the present disclosure are described below with referenceto the drawings. Elements and features described in one of the drawingsor one of the embodiments of the present disclosure may be combined withelements and features described in one or more other drawings orembodiments. It should be noted that representations and descriptions ofcomponents and processing which are irrelevant to the present disclosureor known by those skilled in the art are omitted in the drawings and thespecification for clarity.

Hereinafter, a configuration example of an electronic device forwireless communication according to an embodiment of the presentdisclosure is explained with reference to FIG. 1 . As shown in FIG. 1 ,an electronic device 100 for wireless communication according to theembodiment includes processing circuitry 110. The processing circuitry110 may be implemented as, for example, a specific chip, a chipset, or acentral processing unit (CPU).

The electronic device according to the embodiment may be implemented at,for example, a user equipment side.

The processing circuitry 110 includes a first control unit 111 and asecond control unit 113. It should be noted that, although the firstcontrol unit 111 and the second control unit 113 are shown in a form offunctional block in the drawings, it should be understood that functionsof these units may also be implemented by the processing circuitry as awhole, and are unnecessarily implemented by discrete actual componentsin the processing circuitry. In addition, although the processingcircuitry is shown as one block in the drawings, the electronic devicemay include multiple processing circuitry. The functions of these unitsmay be distributed to the multiple processing circuitry, so that themultiple processing circuitry cooperate to perform these functions.

The first control unit 111 is configured to perform control to performcarrier aggregation communication with a base station through at least afirst cell and a second cell.

The second control unit 113 is configured to perform control to transmitfirst information for beam failure recovery of the second cell to thebase station through the first cell.

According to an embodiment, the first cell may include a primary cell(PCell) or a secondary cell (SCell) having an uplink, and the secondcell may include an SCell having no an uplink.

As mentioned above, in a carrier aggregation (CA) scenario, a UE may beconfigured with multiple cells. For example, a UE can be configured withup to 32 cells, including 1 PCell and 31 SCells. However, theconventional BFR process described above with reference to FIG. 10 isapplicable to PCells and is not applicable to all SCells; for example,the conventional BFR process is not applicable to the SCells only havinga downlink. According to the embodiment, the BFR process may beeffectively performed for various cells in the CA scenario.

It should be noted that it is not limited to transmit BFR informationfor an SCell having no uplink through a PCell or an SCell having anuplink in the embodiment of the present disclosure. For example,considering aspects such as communication quality, resources, andefficiency, BFR information may be transmitted for an SCell having anuplink through a PCell, or BFR information may be transmitted for aPCell through an SCell having an uplink, and so on. That is, the secondcell may include a PCell or an SCell having an uplink.

According to an embodiment, the first information may includeidentification information of the second cell to which a beam failureoccurs and identification information of a candidate beam for a beamfailure recovery.

As an example, the identification information of the second cell and theidentification information of the candidate beam may be transmittedthrough a physical uplink control channel (PUCCH).

In this case, according to an embodiment, the PUCCH may include anindicator bit for indicating that the PUCCH includes BFR information.

In addition, for a cell having an uplink, such as a PCell or an SCellhaving an uplink, the cell may transmit BFR information to the basestation through the cell itself in a case that a beam failure occurs tothe cell.

Accordingly, according to an embodiment, the second control unit 113 maybe configured to perform control to transmit second information for beamfailure recovery of the first cell to the base station through the firstcell.

In this case, BFR information of the first cell is transmitted throughthe first cell, and thus the BFR information may only includeidentification information of a candidate beam.

As an example, the second information may be transmitted through aphysical random access channel (PRACH).

Next, referring to FIGS. 11 to 13 , examples of transmitting a beamfailure recovery request (BFRQ) in different exemplary scenarios aredescribed.

FIG. 11 shows an exemplary scenario where a beam failure occurs to anSCell having an uplink. In this scenario, a BFRQ may be transmitted to abase station (sucha as a gNB) through the SCell. In this scenario, theBFRQ may be transmitted through a PRACH or a PUCCH.

FIGS. 12 and 13 each show an exemplary scenario where a beam failureoccurs to an SCell only having a downlink. In this scenario, a BFRQ maybe transmitted to a base station through a PCell (as shown in FIG. 12 )or an SCell having an uplink (as shown in FIG. 13 ). In this scenario,since it is required to transmit identification information of the cellto which beam failure occurs to the base station, the BFRQ is preferablytransmitted through a PUCCH.

In particular, in a case that a BFRQ of a call is transmitted through anuplink of the cell, the BFRQ may be transmitted through a PRACH, and theBFRQ may include identification information of a candidate beam and doesnot include identification information of the cell to which a beamfailure occurs. In a case that a BFRQ of a cell is transmitted throughanother cell, since the BFRQ needs to including identificationinformation of the cell to which a beam failure occurs, the PRACH may benot sufficient to carry the information, and thus the BFRQ may betransmitted through a PUCCH.

In addition, since a UE may be configured with multiple types of cells,such as a PCell (which may perform RRC communicate with the basestation), an SCell having an uplink, and an SCell only having adownlink, according to an embodiment, the cells configured for the UEmay be grouped, and the BFR process may be performed based on thegrouping.

Hereinafter, a configuration example of an electronic device forwireless communication according to another embodiment is explained withreference to FIG. 2 .

As shown in FIG. 2 , an electronic device 200 according to theembodiment includes processing circuitry 210. The processing circuitry210 includes a first control unit 211, a second control unit 213 and athird control unit 215. Functional configurations of the first controlunit 211 and the second control unit 213 are similar to the functionalconfigurations of the first control unit 111 and the second control unit113 described above with reference to FIG. 1 , respectively.

The third control unit 215 is configured to perform control to receivegrouping information. The grouping information indicates multiple cellsubsets of a cell set for the carrier aggregation communication, each ofthe cell subsets containing at least one first cell.

The grouping information may be determined by the base station andtransmitted to the UE, for example, through RRC control signaling.According to an embodiment, the third control unit 215 may be configuredto perform control to receive grouping information from the base stationthrough RRC signaling.

As an example, FIG. 14 shows an example of grouping all cells configuredfor a UE. In the example, all cells configured for a UE are divided intothree groups base on the total number of PCells and SCells having anuplink. Each of the groups includes one PCell or SCell having an uplink,and includes several SCells only having a downlink. Specifically, in theexample shown in FIG. 14 , group 1 includes a PCell and three SCellshaving only a downlink, and group 2 and group 3 each include one SCellhaving an uplink and three SCells only having a downlink.

Cell grouping may be determined based on different rules. For example,co-located cells may be grouped into a same cell subset.

As an example, as shown in FIG. 15 , a UE is connected to 4 cells, wherecell 1 and cell 2 are co-located cells, and cell 3 and cell 4 areco-located cells. It is assumed that cell 1 and cell 3 are SCells havingan uplink and cell 2 and cell 4 are SCells only having a downlink, thencell 1 and cell 2 may be grouped into one group and cell 3 and cell 4may be grouped into one group based on the above rule.

Co-located cells are grouped into a group, for example, facilitatingsaving communication overhead between base stations.

However, the rule for grouping cell is not limited to the above. Forexample, cells having large differences in locations may bepreferentially grouped into a same cell subset. Still taking thescenario shown in FIG. 15 as an example, cell 1 and cell 4 may begrouped into one group and cell 3 and cell 2 may be grouped into onegroup based on the rule in this example. Cells in different locationsare grouped into a same group, for example, facilitating reducing thepossibility of beam failures occurring to multiple cells in a groupsimultaneously.

Once obtaining the grouping information, when the UE detects a beamfailure, in a case that the beam failure occurs to a PCell or an SCellhaving an uplink, the UE may transmit a BFRQ through the PCell or theSCell having an uplink; and in a case that the beam failure occurs to anSCell only having a downlink, the UE may determine a group including acell to which the beam failure occurs and perform a BFR process based oncell grouping, for example, the UE may transmit a BFRQ through a PCellor an SCell having an uplink which is included in the same group as thecell.

As shown in FIG. 16 , in a case that a beam failure occurs to an SCellonly having a downlink in group 1, a BFRQ may be transmitted through aPCell in group 1; and in a case that a beam failure occurs to an SCellhaving a uplink in group 2, a BFRQ may be transmitted through the SCell.

FIG. 22 shows an exemplary process of BFR. First, UE performs beamfailure detection. In a case of detecting a beam failure, the UEnotifies beam failure information to a PCell or an SCell having anuplink. Then, the PCell or the SCell having an uplink that received thenotification transmit a BFRQ to a base station (for example, a transmitand receive port TRP), where the BFRQ includes a failure cell indicationand a candidate beam indication.

In the case of performing BFR based on cell grouping, since the cellthat transmits the BFRQ may not be the cell to which the beam failureoccurs, it is required to indicate the cell to which the beam failureoccurs in the BFRQ.

According to an embodiment, the third control unit 215 may be configuredto perform control to receive information of a correspondingrelationship between a cell and a cell identifier. The correspondingrelationship may include a corresponding relationship between a physicalcell identifier and a defined global identifier, where the globalidentifier is used to identify a cell in the cell set. Alternatively,the corresponding relationship may include a corresponding relationshipbetween a physical cell identifier and defined group and localidentifiers, where the group identifier is used to identify a cellsubset, and the local identifier is used to identify a cell in a cellsubset.

Accordingly, the first information transmitted to the base station mayinclude a global identifier of the second cell. Alternatively, the firstinformation transmitted to the base station may include a localidentifier of the second cell in a cell subset including the secondcell. The base station may determine the second cell based on the firstcell through which the first information is transmitted and the localidentifier.

Manners of indicating a cell to which a beam failure occurs are furtherexplained below in conjunction with examples.

First, an example of an indication manner with a global identifier isexplained.

As mentioned above, a UE may be configured with up to 32 cells,including a PCell and 31 SCells. Therefore, each of the cells may beconfigured with a global ID having 5 bits, as shown in the followingTable 1.

TABLE 1 Bits IDs of cells having a beam failure 00000 PCell 0 00001SCell 1 00010 SCell 2 . . . . . . 11111  SCell 31

When a cell joins a connection, a physical cell identifier (PCI) of thecell may be obtained by RRC configuration physCellId. Correspondingly,for example, a RRC parameter globalCellId may be introduced to indicatethe cell configured for the UE, and a corresponding relationship betweenthe PCI and the global ID may be established.

More specifically, PCIs may be sorted from small to large, and then eachof the cells is assigned a global ID. For example, in a case that a UEestablishes a connection through three cells, parameters physCellId ofwhich are 23, 47, and 59, respectively, then the three cells may beassigned parameters globalCellId through RRC, as shown in Table 2.

TABLE 2 physCellId globalCellId 23 0 47 1 59 2

Then, an example of an indication manner with a local identifier isexplained.

In a case that all cells of a UE are grouped into k groups, each of thecells in a group may be assigned a local ID, as shown in Table 3.

TABLE 3 Group ID Cell ID 0 0, 1, 2 . . . 1 0, 1, 2 . . . . . . . . . k0, 1, 2 . . .

In each of the groups, a local ID of a cell having an uplink may be 0,and local IDs of other cells may be 1, 2, . . . .

A group ID and a local ID of a cell may be, for example, configured bythe base station using RRC parameters. RRC signaling contains aparameter cellGroupId, which is used to indicate whether a cell isincluded a primary cell group or a secondary cell group. A new RRCparameter GroupID may be defined to indicate group IDs of all the cellsconnecting to the UE, and the local ID may be configured by using aparameter LocalID.

In the transmission of BFRQ based on grouping, a group ID and a local IDare transmitted for accurately indicating each cell.

As shown in FIG. 17 , the number of cell groups k is 3, the number ofSCells only having a downlink is 6, and the number of cells in each ofthe groups is 3. In a case that a cell having a group ID of 1 (01represented in binary) and a local ID of 2 (10 represented in binary)has a beam failure, a BFRQ is transmitted through a cell having a groupID of 1 and a local ID of 0. The ID of the cell having a beam failuremay be expressed as a combination of a group ID and a local IDrepresented in binary, that is, 0110.

Then, another example of an indication manner with a local identifier isexplained.

In a case that a BFRQ of a cell having a beam failure is transmittedthrough a cell having an uplink, and the cell having a beam failure andthe cell having an uplink are included in a same group, the base stationmay determine the group ID of the cell having a beam failure based onthe cell through which the BFRQ is transmitted. For example, the basestation may store the group IDs of all the cells having a uplink, asshown in FIG. 18 . In this case, the BFRQ transmitted to the basestation may not include the group ID and only include the local ID ofthe cell having a beam failure.

As shown in FIG. 18 , the cell having a beam failure and the cellthrough which the BFRQ is transmitted are included in the same group,and it is only required for the UE to transmit the local ID of the cellhaving a beam failure in the BFRQ without transmitting the group ID.

The manners of indicating identification information of a cell to whicha beam failure occurs are described above. Hereinafter, manners ofindicating identification information of a candidate beam for a beamfailure recovery are explained.

According to an embodiment, the identification information of thecandidate beam includes a local identifier of the candidate beam in thesecond cell. The base station may determine the candidate beam based onthe second cell and the local identifier.

The ID of the candidate beam may correspond to a PRACH sequence one toone, and the candidate beam may be indicated through a PRACH. However,in a case that the number of cells configured for a UE is large, thenumber of candidate beams is correspondingly large, and thus therequired PRACH resources are large. For example, if the number of thePRACH resources is equal to the number of candidate beams, each of thecells is required to be configured with up to 64 PRACH resources, and itis required to configure a total of 320 PRACH resources. Therefore,candidate beam information may be preferably transmitted through aPUCCH.

The PUCCH carries control information such as a channel state indicator(CSI), a hybrid automatic repeat request (HARQ), and a schedulingrequest (SR). In a case that a BFRQ is transmitted through a PUCCH, abeam failure indicator may be included in the PUCCH, so that the basestation may determine that the information to be received is a BFRQinstead of other control information mentioned above.

As an example, an all-zero sequence of N symbols may be used as a beamfailure indicator. Since the length of the symbol of the PUCCH formatranging from 1 to 2 or from 4 to 14, in order to distinguish from theseformats and ensure that the beam failure indicator is not too long, forexample, N may be set to 3.

After transmitting the beam failure indicator, the UE may transmit theID of the cell having a beam failure and the ID of the candidate beam tothe base station. For the indication of the ID of the cell having a beamfailure, one may refer to the above exemplary embodiments.

Exemplary manners of transmitting an ID of a candidate beam throughPUCCH are explained below.

In an example, a corresponding relationship between PUCCH resources andIDs of candidate beams may be established in the following manner.Assuming that a UE is configured with n cells, 64×n PUCCH resources arerequired for mapping with the IDs of the candidate beams. Assuming thatn is equal to 4, 256 PUCCH resources are required, and an 8-bit numberrepresented in binary may be used to indicate the IDs of the candidatebeams, as shown in Table 4.

TABLE 4 PUCCH bits IDs of candidate beams 00000000 0 00000001 1 000000102 . . . . . . 11111111 255 

In another example, a corresponding relationship between PUCCH resourcesand IDs of candidate beams may be established in a group-based manner.The group mentioned here refers to a cell, that is, the beams for a cellare grouped into a group. In this manner, a PUCCH sequence no longercorresponds to a candidate beam, but corresponds to a beam set.

For example, assuming that a UE is configured with k cell groups andeach of the cells may be configured with up to 64 beams, k candidatebeams having the same local ID may be regarded as a candidate beam set,and a PUCCH sequence may corresponds to the candidate beam set. That is,each of PUCCH sequences corresponds to a group of candidate beams, andthe beams in the group have a same local ID in the respective cells.

As an example, Table 5 shows a scenario where two cells to which the UEis connected are respectively configured with three candidate beams, andeach of the candidate beams has a local ID in a respective cell.

TABLE 5 Cell ID Local IDs of candidate beams 1 0 1 2 2 0 1 2

In this case, candidate beams having the same local ID may correspond tothe same PUCCH sequence, as shown in Table 6.

TABLE 6 PUCCH bits Candidate beam list 000000 {0, 0} 000001 {1, 1}000010 {2, 2}

In the example shown in Table 6, each of the PUCCH sequences correspondsto a group of candidate beams having the same local ID, and the order ofthe candidate beams in the group may be, for example, based on the IDsof corresponding cells.

Different PUCCH sequences correspond to different candidate beam sets,and a candidate beam may be determined further based on indicationinformation of a cell ID (manners of indicating a cell ID have beenexplained in the above exemplary embodiments). For example, in theexample shown in FIG. 19 , in a case that the PUCCH sequence is 101 andthe cell ID is 3, it may be determined that the candidate beam is a beamhaving a local ID of the cell having an ID of 3.

In the above example, in transmitting BFRQ through PUCCH, for example, abeam failure indication may be transmitted through SR, an ID of afailure beam may be transmitted through the defined PUCCH format, andthe ID of the candidate beam may be transmitted through the definedPUCCH format.

In addition, in a case that the base station knows the ID of the callhaving a failure beam, it is only required for the UE to report thePUCCH sequence to indicate the local ID of the candidate beam (which maybe regarded as the ID of the candidate beam set). Accordingly, thenumber of bits required in PUCCH may be reduced.

As mentioned above, a UE can be configured with multiple cells, and thusbeam failures may occur to multiple cells simultaneously. Examples ofBFR in this case are explained below.

According to an embodiment, in a case that beam failures occur to boththe primary cell and the secondary cell, a beam failure recovery requestof the primary cell may be made preferentially; and in a case that beamfailures occur to both the secondary cell having an uplink and thesecondary cell having no uplink, a beam failure recovery request of thesecondary cell having an uplink may be made preferentially. Since theRRC connection is performed through the primary cell, the primary cellmay be assigned a high priority in the BFR process. For the secondarycells, uplink control signaling may be transmitted through the secondarycell having an uplink, the secondary cell having an uplink beingimportant for the UE, and thus the secondary cell having an uplink maybe assigned a high priority.

In addition, in a case that the cells have been grouped according to theabove embodiments, in a case that beam failures occur to two or morecell subsets, beam failure recovery requests may be simultaneously madethrough respective first cells (such as a primary cell or a secondarycell having an uplink) in the two or more cell subsets.

More specifically, in the beam failure recovery process based on cellgrouping, two exemplary cases may be considered. In a first case, atmost one beam failure occurs in each group. In a second case, more thanone beam failure occurs in at least one group. Examples of BFR in thetwo exemplary cases are respectively explained below.

In the case that at most one beam failure occurs in each group, sincethe processes of beam failure detection and new beam indication may berespectively performed in the groups, BFRQs may be simultaneouslytransmitted through primary cells or secondary cells each having anuplink in the respective groups.

As shown in FIG. 20 , in a case that beam failures simultaneously occurto cell 2 in group 1, cell 1 in group 2 and cell 3 in group 3, BFRQs maybe transmitted to the base station simultaneously through cell 0 ingroup 1, cell 0 in group 2, and cell 0 in group 3.

When multiple BFRQs are transmitted simultaneously, according to theabove embodiments, for example, a failure cell indication and acandidate beam indication may be provide through a PUCCH. Even if a samePUCCH sequence is transmitted through two cells, the base station maydistinguish the candidate beams reported by the two cells since the IDsof the cells having a beam failure are indicated. It should be notedthat, in the case that the same PUCCH sequence is selected for the twocells, the UE should not ignore any of the two cells and should transmitthe PUCCH sequence through each of the two cells, so that the basestation may obtain corresponding information.

In the case that more than one beam failure occurs in at least onegroup, BFRQs may be simultaneously transmitted through primary cell orsecondary cells each having an uplink in the respective groups, and foreach of the groups, only one BFRQ is transmitted at a time. For a groupin which more than one beam failure occurs, a BFRQ of a secondary cellhaving an uplink may be transmitted preferentially (for example, througha primary cell).

As shown in FIG. 21 , in a case that beam failures simultaneously occurto cell 0 and cell 2 in group 1, cell 1 in group 2 and cell 3 in group3, BFRQs of cell 0 in group 1, cell 1 in group 2, and cell 3 in group 3may be simultaneously transmitted to the base station, and then a BFRQof cell 2 in group 1 may be transmitted.

In the above description of the electronic device for wirelesscommunication according to the embodiments of the present disclosure, itis apparent that some processes and methods are also disclosed. Next, awireless communication method according to the embodiments of thepresent disclosure is described without repeating details describedabove.

As shown in FIG. 3 , a wireless communication method according to anembodiment includes a step S310 of performing carrier aggregationcommunication with a base station through at least a first cell and asecond cell and a step S320 of transmitting first information for beamfailure recovery of the second cell to the base station through thefirst cell.

The embodiments of the device and method implemented at a user equipmentside are described above. In addition, the embodiments implemented at abase station side are included in the present disclosure. Next,embodiments of a device and method implemented at a base station sideare described without repeating details of the embodiments describedabove.

As shown in FIG. 4 , an electronic device 400 for wireless communicationaccording to an embodiment includes processing circuitry 410. Theprocessing circuitry 410 includes a first control unit 411 and a secondcontrol unit 413.

The first control unit 411 is configured to perform control to performcarrier aggregation communication with user equipment through at least afirst cell and a second cell.

The second control unit 413 is configured to perform control to receivefirst information for beam failure recovery of the second cell which istransmitted by the user equipment through the first cell.

The first cell may include a primary cell or a secondary cell having anuplink, and the second cell may include a secondary cell having nouplink.

The first information may include identification information of thesecond cell to which a beam failure occurs and identificationinformation of a candidate beam for a beam failure recovery.

The second control unit 413 may be configured to perform control toreceive the identification information of the second cell and theidentification information of the candidate beam through a PUCCH.

The second control unit 413 may be further configured to perform controlto receive second information for beam failure recovery of the firstcell from the user equipment through the first cell. The secondinformation may include identification information of a candidate beam,and the second control unit 413 may be configured to perform control toreceive the second information through a PRACH.

According to an embodiment, the identification information of thecandidate beam may include a local identifier of the candidate beam inthe second cell. The processing circuitry 410 may be configured todetermine the candidate beam based on the second cell and the localidentifier.

FIG. 5 shows a configuration example of an electronic device forwireless communication according to another embodiment. An electronicdevice 500 includes processing circuitry 510. The processing circuitry510 includes a first control unit 511, a second control unit 513, and athird control unit 515. The first control unit 511 and the secondcontrol unit 513 are similar to the first control unit 411 and thesecond control unit 413 described in the above embodiment.

The third control unit 515 is configured to determine groupinginformation and perform control to transmit the determined groupinginformation to the user equipment. The grouping information indicatesmultiple cell subsets of a cell set for the carrier aggregationcommunication, and each of the cell subsets contains at least one firstcell.

The third control unit 515 may be further configured to determine acorresponding relationship between a cell and a cell identifier andperform control to transmit information of the correspondingrelationship to the user equipment. The corresponding relationshipincludes: a corresponding relationship between a physical cellidentifier and a defined global identifier or a correspondingrelationship between a physical cell identifier and defined group andlocal identifiers. The global identifier is used to identify a cell inthe cell set, the group identifier is used to identify a cell subset,and the local identifier is used to identify a cell in a cell subset.

According to an embodiment, the first information received from the userequipment may include a global identifier of the second cell or a localidentifier of the second cell in a cell subset including the secondcell. The third control unit 515 may be configured to determine thesecond cell based on the global identifier or determine the second cellbased on the first cell and the local identifier.

The third control unit 515 may be further configured to perform controlto transmit the grouping information to the user equipment through radioresource control signaling.

FIG. 6 shows a wireless communication method according to an embodiment.

In S610, carrier aggregation communication is performed with userequipment through at least a first cell and a second cell.

In S620, first information for beam failure recovery of the second cellwhich is transmitted by the user equipment through the first cell isreceived.

A computer readable medium is further provided according to anembodiment of the present disclosure. The computer readable mediumincludes executable instructions that, when executed by an informationprocessing apparatus, cause the information processing apparatus toexecute the methods according to the above embodiments.

For example, steps of the above methods and modules and/or units of theabove devices may be implemented as software, firmware, hardware, or acombination thereof. In a case that steps of the above methods andmodules and/or units of the above devices are implemented by software orfirmware, a computer (for example, a general-purpose computer 1400 shownin FIG. 7 ) having a dedicated hardware structure may be installed witha program constituting software for implementing the above methods froma storage medium or a network. When being installed with variousprograms, the computer is capable of performing various functions.

In FIG. 7 , an central processing unit (that is, a CPU) 1401 performsvarious processing in accordance with a program stored in a read onlymemory (ROM) 1402 or a program loaded from a storage portion 1408 to arandom access memory (RAM) 1403. The data required for the variousprocessing performed by the CPU 1401 may be stored in the RAM 1403 asneeded. The CPU 1401, the ROM 1402 and the RAM 1403 are linked to eachother via a bus 1404. An input/output interface 1405 is also linked tothe bus 1404.

The following components are linked to the input/output interface 1405:an input portion 1406 (including a keyboard, a mouse or the like), anoutput portion 1407 (including a display such as a cathode ray tube(CRT), a liquid crystal display (LCD), a loudspeaker or the like), astorage portion 1408 (including a hard disk or the like), and acommunication portion 1409 (including a network interface card such as aLAN card, a modem or the like). The communication portion 1409 performscommunication processing via a network such as the Internet. A driver1410 may also be linked to the input/output interface 1405 as needed. Aremovable medium 1411 such as a magnetic disk, an optical disk, amagneto-optical disk, a semiconductor memory may be installed on thedriver 1410 as needed, so that a computer program read from theremovable medium 1411 is installed into the storage portion 1408 asneeded.

In a case that the above series of processing are implemented bysoftware, a program constituting the software is installed from anetwork such as the Internet, or a storage medium such as the removablemedium 1411.

Those skilled in the art should understand that the storage medium isnot limited to the removable medium 1411 shown in FIG. 7 that stores aprogram and is distributed separately from the apparatus so as toprovide the program to the user. The removable medium 1411, for example,may include: a magnetic disk (including a floppy disk (registeredtrademark)); an optical disk (including a compact disk read only memory(CD-ROM) and a digital versatile disc (DVD)); a magneto-optical disk(including a minidisc (MD) (registered trademark)); and a semiconductormemory. Alternatively, the storage medium may be the ROM 1402, a harddisk included in the storage portion 1408 or the like. The storagemedium has a program stored therein and is distributed to the usertogether with an apparatus in which the storage medium is included.

A program product storing machine-readable instruction codes is furtherprovided according to an embodiment of the present disclosure. Theinstruction codes, when being read and executed by a machine, mayperform the methods according to the above embodiments of the presentdisclosure.

Accordingly, a storage medium for carrying the program product storingthe machine-readable instruction codes is also provided according to thepresent disclosure. The storage medium may include but is not limited toa floppy disk, an optical disk, a magneto-optical disk, a memory card, amemory stick or the like.

The following electronic apparatus is involved in the embodiments of thepresent disclosure. In a case that the electronic apparatus is used forbase station side, the electronic apparatus may be implemented as anytype of gNB or evolved node B (eNB), such as a macro eNB and a smalleNB. The small eNB may be an eNB of a cell having a smaller coveragethan a macro cell, such as a pico-cell eNB, a micro eNB and a home(femto) eNB. Alternatively, the electronic apparatus may be implementedas any other types of base stations, such as a NodeB and a basetransceiver station (BTS). The electronic apparatus may include: a mainbody (also referred to as a base station apparatus) configured tocontrol the wireless communication; and one or more remote radio heads(RRH) provided at a different position from the main body. In addition,various types of terminals, which are described below, may each serve asa base station by performing functions of the base station temporarilyor semi-persistently.

In a case that the electronic apparatus is used for user equipment side,the electronic apparatus may be implemented as a mobile terminal (suchas a smartphone, a tablet personal computer (PC), a notebook PC, aportable game terminal, a portable/dongle mobile router and a digitalcamera) or a vehicle terminal (such as an automobile navigationapparatus). Furthermore, the electronic apparatus may be a wirelesscommunication module (such as an integrated circuitry module including asingle die or multiple dies) mounted on each of the terminals describedabove.

[Application Examples of a Terminal Apparatus]

FIG. 8 is a block diagram showing an exemplary configuration of asmartphone 2500 to which technology according to the present disclosuremay be applied. The smartphone 2500 includes a processor 2501, a memory2502, a storage device 2503, an external connection interface 2504, acamera 2506, a sensor 2507, a microphone 2508, an input device 2509, adisplay device 2510, a loudspeaker 2511, a wireless communicationinterface 2512, one or more antenna switches 2515, one or more antennas2516, a bus 2517, a battery 2518 and an auxiliary controller 2519.

The processor 2501 may be, for example, a CPU or a system on chip (SoC),and controls functions of an application layer and another layer of thesmartphone 2500. The memory 2502 includes an RAM and an ROM, and storesdata and a program executed by the processor 2501. The storage device2503 may include a storage medium such as a semiconductor memory and ahard disk. The external connection interface 2504 is an interface forconnecting an external device (such as a memory card and a universalserial bus (USB) device) to the smartphone 2500.

The camera 2506 includes an image sensor (such as a charge coupleddevice (CCD) and a complementary metal oxide semiconductor (CMOS)), andgenerates a captured image. The sensor 2507 may include a group ofsensors such as a measurement sensor, a gyro sensor, a geomagneticsensor, and an acceleration sensor. The microphone 2508 converts soundthat is inputted to the smartphone 2500 into an audio signal. The inputdevice 2509 includes, for example, a touch sensor configured to detecttouch on a screen of the display device 2510, a keypad, a keyboard, abutton, or a switch, and receives an operation or information inputtedfrom a user. The display device 2510 includes a screen (such as a liquidcrystal display (LCD) and an organic light-emitting diode (OLED)display), and displays an output image of the smartphone 2500. Theloudspeaker 2511 is configured to convert an audio signal outputted fromthe smartphone 2500 into sound.

The wireless communication interface 2512 supports any cellularcommunication scheme (such as LTE and LTE-Advanced), and performswireless communication. The wireless communication interface 2512 mayinclude, for example, a baseband (BB) processor 2513 and radio frequency(RF) circuitry 2514. The BB processor 2513 may perform, for example,coding/decoding, modulating/demodulating andmultiplexing/de-multiplexing, and perform various types of signalprocessing for wireless communications. The RF circuitry 2514 mayinclude, for example, a mixer, a filter and an amplifier, and transmitsand receives a wireless signal via an antenna 2516. The wirelesscommunication interface 2512 may be a chip module having the BBprocessor 2513 and the RF circuitry 2514 integrated thereon. As shown inFIG. 8 , the wireless communication interface 2512 may include multipleBB processors 2513 and multiple RF circuitries 2514. Although FIG. 8shows an example in which the wireless communication interface 2512includes the multiple BB processors 2513 and the multiple RF circuitries2514, the wireless communication interface 2512 may include a single BBprocessor 2513 or single RF circuitry 2514.

Besides the cellular communication scheme, the wireless communicationinterface 2512 may support an additional type of wireless communicationscheme, such as a short-distance wireless communication scheme, a nearfield communication scheme and a wireless local area network (LAN)scheme. In this case, the wireless communication interface 2512 mayinclude the BB processor 2513 and the RF circuitry 2514 for eachwireless communication scheme.

Each of the antenna switches 2515 switches connection destinations ofthe antennas 2516 among multiple circuitry (such as circuitry fordifferent wireless communication schemes) included in the wirelesscommunication interface 2512.

Each of the antennas 2516 includes a single or multiple antenna elements(such as multiple antenna elements included in an MIMO antenna), and isused for the wireless communication interface 2512 to transmit andreceive a wireless signal. The smartphone 2500 may include multipleantennas 2516, as shown in FIG. 8 . Although FIG. 8 shows an example inwhich the smartphone 2500 includes the multiple antennas 2516, thesmartphone 2500 may also include a single antenna 2516.

In addition, the smartphone 2500 may include an antenna 2516 for eachtype of wireless communication scheme. In this case, the antennaswitches 2515 may be omitted from the configuration of the smartphone2500.

The processor 2501, the memory 2502, the storage device 2503, theexternal connection interface 2504, the camera 2506, the sensor 2507,the microphone 2508, the input device 2509, the display device 2510, theloudspeaker 2511, the wireless communication interface 2512, and theauxiliary controller 2519 are connected to each other via the bus 2517.The battery 2518 supplies power to blocks of the smartphone 2500 shownin FIG. 8 via feeders which are partially shown with dashed lines in thedrawings. The auxiliary controller 2519, for example, operates a minimumnecessary function of the smartphone 2500 in a sleep mode.

In the smart phone 2500 shown in FIG. 8 , the transceiving device of theapparatus for user equipment side according to an embodiment of thepresent disclosure may be implemented by the wireless communicationinterface 2512. At least a part of functions of the processing circuitryand/or units of the electronic device or the information processingapparatus for user equipment side according to the embodiments of thepresent disclosure may be implemented by the processor 2501 or theauxiliary controller 2519. For example, the auxiliary controller 2519may perform a part of functions of the processor 2501, to reduce powerconsumption of the battery 2518. Further, the processor 2501 or theauxiliary controller 2519 may perform at least a part of functions ofthe processing circuitry and/or the units of the electronic device orthe information processing apparatus for user equipment side accordingto the embodiments of the present disclosure by executing a programstored in the memory 2502 or the storage device 2503.

[Application Examples of a Base Station]

FIG. 9 is a block diagram showing an exemplary configuration of a gNB towhich the technology according to the present disclosure may be applied.A gNB 2300 includes multiple antennas 2310 and a base station apparatus2320. Each of the antennas 2310 is connected to the base stationapparatus 2320 via a radio frequency (RF) cable.

Each of the antennas 2310 includes a single antenna element or multipleantenna elements (such as multiple antenna elements included in amultiple-input multiple-output (MIMO) antenna), and is used for the basestation apparatus 2320 to transmit and receive a wireless signal. ThegNB 2300 may include multiple antennas 2310, as shown in FIG. 9 . Forexample, the multiple antennas 2310 may be compatible with multiplefrequency bands used by the gNB 2300. Although FIG. 9 shows an examplein which the gNB 2300 includes multiple antennas 2310, the gNB 2300 mayinclude a single antenna 2310.

The base station apparatus 2320 includes a controller 2321, a memory2322, a network interface 2323 and a wireless communication interface2325.

The controller 2321 may be, for example, a CPU or a DSP, and operatevarious functions of a high layer of the base station apparatus 2320.For example, the controller 2321 generates a data packet based on datain a signal processed by the wireless communication interface 2325 andtransmits the generated packet via the network interface 2323. Thecontroller 2321 may bundle data from multiple baseband processors togenerate a bundled packet and transmit the generated bundled packet. Thecontroller 2321 may have a logic function that performs control such asradio resource control, radio bearer control, mobility management,admission control, and scheduling. The control may be performed incombination with a nearby gNB or core network node. The memory 2322includes an RAM and an ROM, and stores a program executed by thecontroller 2321 and various types of control data (such as a terminallist, transmission power data and scheduling data).

The network interface 2323 is a communication interface via which thebase station apparatus 2320 is connected to a core network 2324. Thecontroller 2321 may communicate with a core network node or another gNBvia the network interface 2323. In this case, the gNB 2300 may beconnected to the core network node or other gNB via a logical interface(such as an S₁ interface and an X2 interface). The network interface2323 may also be a wired communication interface or a wirelesscommunication interface for wireless backhaul line. If the networkinterface 2323 is the wireless communication interface, the networkinterface 2323 may use a frequency band for wireless communicationhigher than a frequency band used by the wireless communicationinterface 2325.

The wireless communication interface 2325 supports any cellularcommunication scheme (such as long term evolution (LTE) andLTE-Advanced), and provides wireless connection to a terminal positionedin a cell of the gNB 2300 via an antenna 2310. The wirelesscommunication interface 2325 may include, for example, a BB processor2326 and RF circuitry 2327. The BB processor 2326 may perform, forexample, encoding/decoding, modulating/demodulating andmultiplexing/de-multiplexing, and various types of signal processing oflayers (such as L1, medium access control (MAC), radio link control(RLC) and packet data convergence protocol (PDCP)). Instead of thecontroller 2321, the BB processor 2326 may have a part or all of theabove logic functions. The BB processor 2326 may be implemented as amemory storing a communication control program, or a module including aprocessor configured to execute a program and related circuitry. Thefunction of the BB processor 2326 may be changed by updating theprogram. The module may be a card or blade inserted into a slot of thebase station apparatus 2320. Alternatively, the module may be a chipmounted on the card or the blade. Further, the RF circuitry 2327 mayinclude, for example, a mixer, a filter or an amplifier, and transmitsand receives a wireless signal via the antenna 2310.

As shown in FIG. 9 , the wireless communication interface 2325 mayinclude multiple BB processors 2326. For example, the multiple BBprocessors 2326 may be compatible with multiple frequency bands used bythe gNB 2300. As shown in FIG. 9 , the wireless communication interface2325 may include multiple RF circuitry 2327. For example, the multipleRF circuitry 2327 may be compatible with multiple antenna elements.Although FIG. 9 shows an example in which the wireless communicationinterface 2325 includes multiple BB processors 2326 and multiple RFcircuitry 2327, the wireless communication interface 2325 may include asingle BB processor 2326 or single RF circuitry 2327.

In the gNB 2300 shown in FIG. 9 , the transceiving device of thewireless communication apparatus for base station side according to anembodiment of the present disclosure may be implemented by the wirelesscommunication interface 2325. At least a part of functions of theprocessing circuitry and/or units of the electronic device or thewireless communication apparatus for base station side may beimplemented by the controller 2321. For example, the controller 2321 mayperform at least a part of functions of the processing circuitry and/orthe units of the electronic device or the wireless communicationapparatus for base station side by executing the program stored in thememory 2322.

In the above description of specific embodiments of the presentdisclosure, features described and/or illustrated for one embodiment maybe used in one or more other embodiments in the same or similar manner,or may be combined with features in other embodiments, or may replacefeatures in other embodiments.

It should be emphasized that terms of “include/comprise” used hereinindicate presence of a feature, an element, a step, or a component, butdo not exclude presence or addition of one or more other features,elements, steps or components.

In the above embodiments and examples, reference numerals consist ofnumbers are used to represent steps and/or units. Those skilled in theart should understand that these reference numerals are only for purposeof illustration and drawing and are not indicative of the order or anyother limitations thereof.

In addition, the method according to the present disclosure is notlimited to be performed in the chronological order described herein, andmay be performed in other chronological order, in parallel orindependently. Therefore, the order in which the method is performeddescribed herein does not limit the technical scope of the presentdisclosure.

Although the present disclosure is described above through the specificembodiments of the present disclosure, it should be understood that allembodiments and examples described above are illustrative rather thanrestrictive. Various modifications, improvements and equivalents may bemade to the present disclosure by those skilled in the art within thescope and spirit of the attached claims. These modifications,improvements or equivalents should fall within the protection scope ofthe present disclosure.

In addition, the embodiments of the present disclosure further include:

(1) An electronic device for wireless communication, comprisingprocessing circuitry configured to:

-   -   perform control to perform carrier aggregation communication        with a base station through at least a first cell and a second        cell; and    -   perform control to transmit first information for beam failure        recovery of the second cell to the base station through the        first cell.

(2) The electronic device according to (1), wherein the first cellcomprises a primary cell or a secondary cell having an uplink, and thesecond cell comprises a secondary cell having no uplink.

(3) The electronic device according to (1), wherein the firstinformation comprises identification information of the second cell towhich a beam failure occurs and identification information of acandidate beam for a beam failure recovery.

(4) The electronic device according to (3), wherein the processingcircuitry is configured to transmit the identification information ofthe second cell and the identification information of the candidate beamthrough a physical uplink control channel PUCCH.

(5) The electronic device according to (4), wherein the PUCCH comprisesan indicator bit for indicating that the PUCCH comprises the firstinformation.

(6) The electronic device according to (1), wherein the processingcircuitry is further configured to perform control to transmit secondinformation for beam failure recovery of the first cell to the basestation through the first cell.

(7) The electronic device according to (6), wherein the secondinformation comprises identification information of a candidate beam,and the processing circuitry is configured to transmit the secondinformation through a physical random access channel PRACH.

(8) The electronic device according to (1), wherein the processingcircuitry is further configured to perform control to receive groupinginformation, wherein the grouping information indicates a plurality ofcell subsets of a cell set for the carrier aggregation communication,each of the cell subsets containing at least one said first cell.

(9) The electronic device according to (8), wherein the groupinginformation is determined based on the following rule:

-   -   grouping co-located cells into a same cell subset; or    -   preferentially grouping cells having large differences in        locations into a same cell subset.

(10) The electronic device according to (8), wherein the processingcircuitry is further configured to perform control to receiveinformation of a corresponding relationship between a cell and a cellidentifier, and the corresponding relationship comprises:

-   -   a corresponding relationship between a physical cell identifier        and a defined global identifier; or    -   a corresponding relationship between a physical cell identifier        and defined group and local identifiers;    -   wherein the global identifier is used to identify a cell in the        cell set, the group identifier is used to identify a cell        subset, and the local identifier is used to identify a cell in a        cell subset.

(11) The electronic device according to (10), wherein the firstinformation transmitted to the base station comprises:

-   -   a global identifier of the second cell; or    -   a local identifier of the second cell in a cell subset        comprising the second cell.

(12) The electronic device according to (8), wherein the processingcircuitry is configured to perform control to receive the groupinginformation from the base station through radio resource controlsignaling.

(13) The electronic device according to (3), wherein the identificationinformation of the candidate beam comprises a local identifier of thecandidate beam in the second cell.

(14) The electronic device according to (2), wherein the processingcircuitry is configured to make a beam failure recovery request based onone or more of the following rules:

-   -   making a beam failure recovery request of the primary cell        preferentially, in a case where beam failures occur to both the        primary cell and the secondary cell; and    -   making a beam failure recovery request of the secondary cell        having an uplink preferentially, in a case where beam failures        occur to both the secondary cell having an uplink and the        secondary cell having no uplink.

(15) The electronic device according to (8), wherein the processingcircuitry is configured to simultaneously make beam failure recoveryrequests through first cells in two or more cell subsets, in a casewhere beam failures occur to the two or more cell subsets.

(16) A wireless communication method, comprising:

-   -   performing carrier aggregation communication with a base station        through at least a first cell and a second cell; and    -   transmitting first information for beam failure recovery of the        second cell to the base station through the first cell.

(17) An electronic device for wireless communication, comprisingprocessing circuitry configured to:

-   -   perform control to perform carrier aggregation communication        with user equipment through at least a first cell and a second        cell; and    -   perform control to receive first information for beam failure        recovery of the second cell which is transmitted by the user        equipment through the first cell.

(18) The electronic device according to (17), wherein the first cellcomprises a primary cell or a secondary cell having an uplink, and thesecond cell comprises a secondary cell having no uplink.

(19) The electronic device according to (17), wherein the firstinformation comprises identification information of the second cell towhich a beam failure occurs and identification information of acandidate beam for a beam failure recovery.

(20) The electronic device according to (19), wherein the processingcircuitry is configured to receive the identification information of thesecond cell and the identification information of the candidate beamthrough a physical uplink control channel PUCCH.

(21) The electronic device according to (17), wherein the processingcircuitry is further configured to perform control to receive secondinformation for beam failure recovery of the first cell from the userequipment through the first cell.

(22) The electronic device according to (21), wherein the secondinformation comprises identification information of a candidate beam,and the processing circuitry is configured to receive the secondinformation through a physical random access channel PRACH.

(23) The electronic device according to (17), wherein the processingcircuitry is further configured to determine grouping information andperform control to transmit the grouping information to the userequipment, wherein the grouping information indicates a plurality ofcell subsets of a cell set for the carrier aggregation communication,each of the cell subsets containing at least one said first cell.

(24) The electronic device according to (23), wherein the processingcircuitry is further configured to determine a correspondingrelationship between a cell and a cell identifier and perform control totransmit information of the corresponding relationship to the userequipment, and the corresponding relationship comprises:

-   -   a corresponding relationship between a physical cell identifier        and a defined global identifier; or    -   a corresponding relationship between a physical cell identifier        and defined group and local identifiers;    -   wherein the global identifier is used to identify a cell in the        cell set, the group identifier is used to identify a cell        subset, and the local identifier is used to identify a cell in a        cell subset.

(25) The electronic device according to (24), wherein the firstinformation received from the user equipment comprises a globalidentifier of the second cell or a local identifier of the second cellin a cell subset comprising the second cell, and

-   -   the processing circuitry is configured to: determine the second        cell based on the global identifier, or determine the second        cell based on the first cell and the local identifier.

(26) The electronic device according to (23), wherein the processingcircuitry is configured to perform control to transmit the groupinginformation to the user equipment through radio resource controlsignaling.

(27) The electronic device according to (19), wherein the identificationinformation of the candidate beam comprises a local identifier of thecandidate beam in the second cell, and the processing circuitry isconfigured to determine the candidate beam based on the second cell andthe local identifier.

(28) A wireless communication method, comprising:

-   -   performing carrier aggregation communication with user equipment        through at least a first cell and a second cell; and    -   receiving first information for beam failure recovery of the        second cell which is transmitted by the user equipment through        the first cell.

(29) A computer readable medium comprising executable instructions that,when executed by an information processing apparatus, cause theinformation processing apparatus to execute the method according to (16)or (28).

The invention claimed is:
 1. An electronic device for wirelesscommunication, comprising processing circuitry configured to: performcontrol to perform carrier aggregation communication with a base stationthrough at least a first cell and a second cell; and perform control totransmit first information for beam failure recovery of the second cellto the base station through the firs cell, wherein the first cellcomprises a primary cell or a secondary cell having an uplink, and thesecond cell comprises a secondary cell having no uplink, wherein theprocessing circuitry is configured to make a beam failure recoveryrequest based on one or more of the following rules: making a beamfailure recovery request of the primary cell preferentially, in a casewhere beam failures occur to both the primary cell and at least one ofthe secondary cell having the uplink and the secondary cell having nouplink; and making a beam failure recovery request of the secondary cellhaving an uplink preferentially, in a case where beam failures occur toboth the secondary cell having the uplink and the secondary cell havingno uplink.
 2. The electronic device according to claim 1, wherein thefirst information comprises identification information of the secondcell to which a beam failure occurs and identification information of acandidate beam for a beam failure recovery.
 3. The electronic deviceaccording to claim 2, wherein the processing circuitry is configured totransmit the identification information of the second cell and theidentification information of the candidate beam through a physicaluplink control channel PUCCH.
 4. The electronic device according toclaim 2, wherein the identification information of the candidate beamcomprises a local identifier of the candidate beam in the second cell.5. The electronic device according to claim 1, wherein the processingcircuitry is further configured to perform control to transmit secondinformation for beam failure recovery of the first cell to the basestation through the first cell.
 6. The electronic device according toclaim 5, wherein the second information comprises identificationinformation of a candidate beam, and the processing circuitry isconfigured to transmit the second information through a physical randomaccess channel PRACH.
 7. The electronic device according to claim 1,wherein the processing circuitry is further configured to performcontrol to receive grouping information, wherein the groupinginformation indicates a plurality of cell subsets of a cell set for thecarrier aggregation communication, each of the cell subsets containingat least one said first cell.
 8. The electronic device according toclaim 7, wherein the processing circuitry is further configured toperform control to receive information of a corresponding relationshipbetween a cell and a cell identifier, and the corresponding relationshipcomprises: a corresponding relationship between a physical cellidentifier and a defined global identifier; or a correspondingrelationship between a physical cell identifier and defined group andlocal identifiers; wherein the global identifier is used to identify acell in the cell set, the group identifier is used to identify a cellsubset, and the local identifier is used to identify a cell in a cellsubset.
 9. The electronic device according to claim 8, wherein the firstinformation transmitted to the base station comprises: a globalidentifier of the second cell; or a local identifier of the second cellin a cell subset comprising the second cell.
 10. The electronic deviceaccording to claim 7, wherein the processing circuitry is configured tosimultaneously make beam failure recovery requests through first cellsin two or more cell subsets, in a case where beam failures occur to thetwo or more cell subsets.
 11. An electronic device for wirelesscommunication, comprising processing circuitry configured to: performcontrol to perform carrier aggregation communication with user equipmentthrough at least a first cell and a second cell; and perform control toreceive first information for beam failure recovery of the second cellwhich is transmitted by the user equipment through the first cell,wherein the first cell comprises a primary cell or a secondary cellhaving an uplink, and the second cell comprises a secondary cell havingno uplink, wherein the processing circuitry is configured to receive abeam failure recovery request based on one or more of the followingrules: receiving a beam failure recovery request of the primary cellpreferentially, in a case where beam failures occur to both the primarycell and at least one of the secondary cell having the uplink and thesecondary cell having no uplink; and receiving a beam failure recoveryrequest of the secondary cell having an uplink preferentially, in a casewhere beam failures occur to both the secondary cell having the uplinkand the secondary cell having no uplink.
 12. The electronic deviceaccording to claim 11, wherein the first information comprisesidentification information of the second cell to which a beam failureoccurs and identification information of a candidate beam for a beamfailure recovery.
 13. The electronic device according to claim 12,wherein the processing circuitry is configured to receive theidentification information of the second cell and the identificationinformation of the candidate beam through a physical uplink controlchannel PUCCH.
 14. The electronic device according to claim 11, whereinthe processing circuitry is further configured to perform control toreceive second information for beam failure recovery of the first cellfrom the user equipment through the first cell.
 15. The electronicdevice according to claim 14, wherein the second information comprisesidentification information of a candidate beam, and the processingcircuitry is configured to receive the second information through aphysical random access channel PRACH.
 16. The electronic deviceaccording to claim 11, wherein the processing circuitry is furtherconfigured to determine grouping information and perform control totransmit the grouping information to the user equipment, wherein thegrouping information indicates a plurality of cell subsets of a cell setfor the carrier aggregation communication, each of the cell subsetscontaining at least one said first cell.
 17. The electronic deviceaccording to claim 16, wherein the processing circuitry is furtherconfigured to determine a corresponding relationship between a cell anda cell identifier and perform control to transmit information of thecorresponding relationship to the user equipment, and the correspondingrelationship comprises: a corresponding relationship between a physicalcell identifier and a defined global identifier; or a correspondingrelationship between a physical cell identifier and defined group andlocal identifiers; wherein the global identifier is used to identify acell in the cell set, the group identifier is used to identify a cellsubset, and the local identifier is used to identify a cell in a cellsubset.